linux-kernel - Re: [PATCH] dmaengine/dw_dmac: Reconfigure interrupt and chan

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Date:	Mon, 28 Nov 2011 08:50:56 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Viresh Kumar <viresh.kumar@...com>
Cc:	linux-kernel@...r.kernel.org, armando.visconti@...com,
	shiraz.hashim@...com, vipin.kumar@...com, rajeev-dlh.kumar@...com,
	deepak.sikri@...com, vipulkumar.samar@...com, amit.virdi@...com,
	pratyush.anand@...com, bhupesh.sharma@...com,
	viresh.linux@...il.com, bhavna.yadav@...com,
	vincenzo.frascino@...com, mirko.gardi@...com
Subject: Re: [PATCH] dmaengine/dw_dmac: Reconfigure interrupt and chan_cfg
 register on resume

On Thu, 2011-11-17 at 16:01 +0530, Viresh Kumar wrote:
> In S2R all DMA registers are reset by hardware and thus they are
> required to be
> reprogrammed. The channels which aren't reprogrammed are channel
> configuration
> and interrupt enable registers, which are currently programmed at
> chan_alloc
> time.
> 
> This patch creates another routine to initialize a channel. It will
> try to
> initialize channel on every dwc_dostart() call. If channel is already
> initialised then it simply returns, otherwise it configures registers.
> 
> This routine will also initialize registers on wakeup from S2R, as we
> mark
> channels as uninitialized on suspend.
> 
> Signed-off-by: Viresh Kumar <viresh.kumar@...com> 
Applied thanks

-- 
~Vinod

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